Answer:
They used 3.14 for pi:


Step-by-step explanation:
 is the volume of a sphere with radius r.
 is the volume of a sphere with radius r.
I think that is the diameter given in the picture.
The radius is half the diameter.
So the radius is 5 since the diameter is 10.
Plug in this gives you:

 
        
                    
             
        
        
        
        
It’s the first one on the top left corner
 
        
                    
             
        
        
        
Answer:
Common ratio = -8
Step-by-step explanation: